import React, { useState, useRef, useEffect } from 'react';
import { StyleSheet, View, StatusBar, Alert, ActivityIndicator } from 'react-native';
import { Text, IconButton, Surface } from 'react-native-paper';
import { SafeAreaView } from 'react-native-safe-area-context';
import { useRoute, useNavigation } from '@react-navigation/native';
import Video, { type VideoRef } from 'react-native-video';

export default function VideoPlayerScreen() {
  const route = useRoute<any>();
  const navigation = useNavigation<any>();
  const { cameraName, streamUrl } = route.params;
  const videoRef = useRef<VideoRef>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [paused, setPaused] = useState(false);
  const [muted, setMuted] = useState(true);

  useEffect(() => {
    if (!streamUrl) {
      setError('无视频流地址');
      setLoading(false);
    }
  }, [streamUrl]);

  const handleLoad = () => {
    setLoading(false);
    setError(null);
  };

  const handleError = (e: any) => {
    setLoading(false);
    const msg = e?.error?.errorString || e?.error?.localizedDescription || '视频加载失败';
    setError(msg);
  };

  return (
    <View style={styles.container}>
      <StatusBar barStyle="light-content" />
      <SafeAreaView style={styles.header} edges={['top']}>
        <IconButton
          icon="arrow-left"
          iconColor="white"
          size={24}
          onPress={() => navigation.goBack()}
        />
        <Text style={styles.headerTitle}>{cameraName}</Text>
        <View style={{ width: 48 }} />
      </SafeAreaView>

      <View style={styles.videoContainer}>
        {error ? (
          <View style={styles.errorContainer}>
            <IconButton icon="alert-circle-outline" size={48} iconColor="#B8B3AA" />
            <Text style={styles.errorText}>{error}</Text>
          </View>
        ) : (
          <>
            {streamUrl ? (
              <Video
                ref={videoRef}
                source={{ uri: streamUrl }}
                style={styles.video}
                resizeMode="contain"
                paused={paused}
                muted={muted}
                onLoad={handleLoad}
                onError={handleError}
                playInBackground={false}
                controls={false}
                bufferConfig={{
                  minBufferMs: 1000,
                  maxBufferMs: 3000,
                  bufferForPlaybackMs: 500,
                  bufferForPlaybackAfterRebufferMs: 1000,
                }}
              />
            ) : null}

            {loading ? (
              <View style={styles.loadingOverlay}>
                <ActivityIndicator size="large" color="white" />
                <Text style={styles.loadingText}>加载中...</Text>
              </View>
            ) : null}

            {!loading && !error ? (
              <View style={styles.controlsOverlay}>
                <Surface style={styles.controlBar}>
                  <IconButton
                    icon={paused ? 'play' : 'pause'}
                    iconColor="white"
                    size={28}
                    onPress={() => setPaused(!paused)}
                  />
                  <IconButton
                    icon={muted ? 'volume-off' : 'volume-high'}
                    iconColor="white"
                    size={24}
                    onPress={() => setMuted(!muted)}
                  />
                </Surface>
              </View>
            ) : null}
          </>
        )}
      </View>

      <View style={styles.footer}>
        <Text style={styles.streamUrl}>流地址: {streamUrl || 'N/A'}</Text>
      </View>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#000',
  },
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    backgroundColor: '#1A1815',
    paddingHorizontal: 4,
  },
  headerTitle: {
    color: 'white',
    fontSize: 18,
    fontWeight: '500',
    flex: 1,
    textAlign: 'center',
  },
  videoContainer: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#000',
  },
  video: {
    width: '100%',
    height: '100%',
  },
  loadingOverlay: {
    ...StyleSheet.absoluteFillObject,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: 'rgba(26,24,21,0.5)',
  },
  loadingText: {
    color: 'white',
    marginTop: 12,
  },
  controlsOverlay: {
    position: 'absolute',
    bottom: 24,
    left: 0,
    right: 0,
    alignItems: 'center',
  },
  controlBar: {
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: 'rgba(26,24,21,0.6)',
    borderRadius: 28,
    paddingHorizontal: 8,
    elevation: 0,
  },
  errorContainer: {
    alignItems: 'center',
    justifyContent: 'center',
  },
  errorText: {
    color: '#B8B3AA',
    fontSize: 16,
    marginTop: 8,
    textAlign: 'center',
    paddingHorizontal: 32,
  },
  footer: {
    padding: 12,
    backgroundColor: '#1A1815',
  },
  streamUrl: {
    color: '#8C8780',
    fontSize: 11,
  },
});